urban center vs Bydgoszcz

urban center and Bydgoszcz both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Bydgoszcz	Yes	No	No	No

urban center (noun)	Bydgoszcz (noun)
a large and densely populated urban area; may include several independent administrative districts	an industrial city and river port in northern Poland